/*
 * nwpu/2012/2012_4.c
 *
 * Harry Wei <harryxiyou@gmail.com> (C) 2013
 */
#include <stdio.h>

int main(int argc, char *argv[]) {
	double a = 0.0;
	double b = 0.0;
	double c = 0.0;

	scanf("%f%f%f", &a, &b, &c);
	if ((a + b > c) && (a + c > b) &&
		(b + c > a) && (a - b < c) &&
		(a - c < b) && (b -c < a)) {
		printf("Y\n");
	} else {
		printf("N\n");
	}
	return 0;
}